West Yorkshire Police said the collapse is not being treated as suspicious.

A force spokesman said: "At 1.20pm on Sunday, police were contacted by medical staff at Leeds General Infirmary reporting a 14-year-old boy who was in a critical condition after collapsing during an organised kickboxing contest at Alexandra Mill, Morley, on Saturday night.

"The family of the boy are at the hospital and have been spoken to by officers.

"Inquiries are being carried out into the circumstances."

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Scott was a member of Marsden's All Styles Kickboxing, in Sheffield.

The club posted a statement on Facebook on Sunday which said training was cancelled until further notice.

A post written earlier in the day said: "Unfortunately, (Saturday) night's English title fight had to be stopped due to Scotty needing immediate medical attention."